Are you truly comparing the "accidental" shooting down of a military plane to an actual boots on the ground invasion of a sovereign nation? These are so wastly different that mentioning apples and oranges doesn't even come close to it.
It was not accidental. A plane capable of caring nuclear bombs was in their airspace.
I'm not comparing anything - I was referring to "end of the world". According to Turkish strategist, nuclear weapon is not usable, so they have no problem to retaliate.
They are all rational actors. Turks killed Russian solders in Syria, where they nuked? Putin is bluffing.
In case of aggression, you have to sand your ground, there is no other option.